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  <title>Get unstable period</title>
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  <div id="layout-content"><div id="function.trader-get-unstable-period" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">trader_get_unstable_period</h1>
  <p class="verinfo">(PECL trader &gt;= 0.2.2)</p><p class="refpurpose"><span class="refname">trader_get_unstable_period</span> &mdash; <span class="dc-title">Get unstable period</span></p>

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 <div class="refsect1 description" id="refsect1-function.trader-get-unstable-period-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>trader_get_unstable_period</strong></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$functionId</code></span>
   ) : <span class="type">int</span></div>

  <p class="para rdfs-comment">
   Get unstable period factor for a particular function.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.trader-get-unstable-period-parameters">
  <h3 class="title">参数</h3>
  <dl>

   
    <dt>
<code class="parameter">functionId</code></dt>

    <dd>

     <p class="para">
      Function ID the factor to be read for. <a href="trader.constants.html" class="link">TRADER_FUNC_UNST_*</a> series of constants should be used.
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.trader-get-unstable-period-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">Returns the unstable period factor for the corresponding function.</p>
 </div>



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